The compensating crank is an adjustable lever in the feedback linkage between the servomotor and the large plunger of the dashpot. Adjusting the compensating crank adjusts the amount the large dashpot plunger moves for a given movement of the servomotor. If there is no leakage in the oil reservoir, the small dashpot plunger will move rigidly with the large plunger and there will be additional permanent speed droop. To provide temporary droop, an adjustable needle valve is provided on the dashpot to provide a leakage path that allows the small dashpot plunger to return to its original position at.
